/Engine/Source/Runtime/Online/BuildPatchServices/Public/Interfaces/IBuildManifest.h
Gets a list of files that are installed in InstallPath, but no longer required by this Manifest.
void GetRemovableFiles ( const TCHAR * InstallPath, [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & RemovableFiles ) const